What on the rungs of the ladder of dna is is composed of

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

One of the purposes of transcription is to produce a sequence of bases that

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent